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Castor oil prices, compared per fluid ounce

Compare current price per fluid ounce across pure oils, Jamaican black castor oil, rosemary blends, and other hair and scalp formulas. Ordering is computed from unit price and value score alone — no sponsorships, no paid placement.

Castor oil is widely marketed for hair growth, but evidence that it increases growth is lacking. Unit price measures cost, not effectiveness.

LIVE · Prices refreshed as of Sep 14, 2026, 10:14 PM ET.

Does castor oil make hair grow faster?

What the evidence actually says about ricinoleic acid, scalp health, and growth claims.

Read the evidence

New to castor oil? Start here

The complete evidence-based guide: what castor oil can and cannot do, how to choose a bottle, and how to use it safely.

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Value scores come from unit price only. We refresh listings regularly and never accept placement fees.

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Frequently asked questions

Does castor oil make hair grow faster?
There is no good clinical evidence that topical castor oil increases the rate of hair growth or reverses hair loss. It can coat strands, add temporary shine, and be used in a cosmetic pre-wash routine. Persistent shedding, thinning, bald patches, or scalp symptoms should be evaluated by a qualified clinician.
How current are these prices?
Every displayed price was pulled from Amazon within the last 24 hours and includes a refresh time. If the data becomes older than 24 hours, prices disappear and the site shows product links only.
What does price per fluid ounce mean?
It is the current Amazon price divided by the total liquid volume, including pack count. This makes a small dropper and a large bottle comparable. Unit price measures cost, not ingredient quality or effectiveness.
What is the difference between cold-pressed and Jamaican black castor oil?
Cold-pressed oil is made from unroasted beans and is usually pale with a mild scent. Jamaican black castor oil uses roasted beans and is dark with a smoky aroma. The practical differences are processing, color, scent, texture, and price; neither label proves a hair-growth benefit.
How is the value score calculated?
The score compares a product’s unit price with the median for products in the same category and form. A score of 50 is the median. Scores are shown only when bottle size can be parsed with high confidence.
How does this site make money?
As an Amazon Associate, this site earns from qualifying purchases made through its links. Rankings are computed from unit price and are not influenced by commissions.